Gizzard (proventriculus) in cockroach lies between

Which of the following statement$(s)$ is/are correct about the nervous system of a cockroach?
$(i)$ It consists of a series of fused segmentally arranged ganglia joined by paired longitudinal connectives on the ventral side.
$(ii)$ There are six ganglia lie in the thorax,and three in the abdomen.
$(iii)$ The sense organs are antennae,eyes,maxillary palps,labial palps,and anal cerci,etc.
$(iv)$ Each eye consists of about $5000$ hexagonal ommatidia.

Which is a characteristic of a cockroach?

The body cavity in a cockroach is also known as ........

Select the incorrect statement regarding the heart of a cockroach.

If the head of a cockroach is removed,it may live for a few days because: